EP2060667B1 - Haushaltsgerät - Google Patents

Haushaltsgerät Download PDF

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Publication number
EP2060667B1
EP2060667B1 EP07121046A EP07121046A EP2060667B1 EP 2060667 B1 EP2060667 B1 EP 2060667B1 EP 07121046 A EP07121046 A EP 07121046A EP 07121046 A EP07121046 A EP 07121046A EP 2060667 B1 EP2060667 B1 EP 2060667B1
Authority
EP
European Patent Office
Prior art keywords
magnet
casing
electromagnet
vibration damper
household appliance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07121046A
Other languages
English (en)
French (fr)
Other versions
EP2060667A1 (de
Inventor
Alberto Pezzutto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to ES07121046T priority Critical patent/ES2349442T3/es
Priority to DE602007007963T priority patent/DE602007007963D1/de
Priority to EP07121046A priority patent/EP2060667B1/de
Priority to AT07121046T priority patent/ATE474953T1/de
Priority to PL07121046T priority patent/PL2060667T3/pl
Priority to RU2008145562/12A priority patent/RU2467106C2/ru
Publication of EP2060667A1 publication Critical patent/EP2060667A1/de
Application granted granted Critical
Publication of EP2060667B1 publication Critical patent/EP2060667B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Unbalance; Noise level

Definitions

  • the present invention relates to a household appliance.
  • the present invention relates to a laundry washing machine to which the following description refers purely by way of example.
  • the entire washing assembly i.e. the washing tub and the revolving drum mounted in axially rotating manner inside the washing tub
  • the entire washing assembly is normally suspended in floating manner into the machine casing via a system of springs and dampers designed to absorb the vibrations before they reach the casing.
  • the floating suspension system fails to sufficiently reduce machine vibrations reaching the casing, so that the washing machine becomes noisy.
  • a washing machine rests on a flexible floor, such as a wooden floor, a soft floor, or a floor resting on a thin slab
  • the vibrations generated by the revolving drum during the spin cycle may be resonance-amplified to an unacceptable noise level, and may damage not only the washing machine but also the floor.
  • a vibration damper fixed to the casing to reduce vibrations of the washing machine at resonance speeds, and which comprises an oscillating mass and a number of coil springs connecting the oscillating mass to the washing machine casing.
  • the oscillating mass and the coil spring system are properly dimensioned to vibrate, during rotation of the drum, in phase-opposition with respect to vibrations transmitted to the casing by the floating suspension system, thus reducing the amplitude of the casing vibrations.
  • drum rotation speeds at which resonance phenomena take place also depend on the unevenly distribution of the laundry on the lateral wall of the revolving drum, and on the installation conditions (for example on the type of floor upon which the washing machine rests). Thus resonance phenomena vary from one washing machine to another and from one installation place to another, and it is therefore practically impossible to precisely determine, at manufacturing stage, the frequencies at which to tune up the "Frahm damper".
  • US 2005/188472 A1 discloses a washer comprising a tub, a drum rotatably provided within the tub, a cylinder supported by either a base or the tub, a piston supported by either the tub or the base, the piston being coupled with the cylinder to enable a relative reciprocating motion, the piston generating a magnetic force with power impression; the washer also comprises a vibration-absorbing part provided within the cylinder, the vibration-absorbing part generating a frictional force by coming into contact with an inner circumference of the cylinder, the vibration-absorbing part being attached to the piston by the magnetic force to absorb a vibration transferred to the cylinder or the piston.
  • US 2005/188472 A1 also discloses a washer comprising a tub, a drum rotatably provided within the tub, a cylinder and a piston supported by a base and the tub, the cylinder and the piston being assembled together to enable relative reciprocating motion; the washer also comprises a vibration-absorbing part provided within the cylinder, the vibration-absorbing part generating a magnetic force with power impression, the vibration-absorbing part being attached to the piston by the magnetic force to absorb a vibration transferred to the cylinder or the piston.
  • Number 1 indicates as a whole a household appliance comprising a casing 2 which is liable to severe machine vibrations during functioning.
  • household appliance 1 is a laundry washing machine 1 comprising a parallelepiped-shaped outer box casing 2 resting on the floor; a cylindrical washing tub 3 which is connected in floating manner to casing 2 by a suspension system 4; and a revolving drum 5 for housing the laundry to be washed, and which is fitted in rotary manner inside washing tub 3.
  • washing tub 3 is provided with a front opening 3a faced to a corresponding laundry loading and unloading opening (not shown) which is formed in the front face of casing 2 and is selectively closable by a door (not shown) hinged to casing 2; whereas revolving drum 5 is mounted in axially rotating manner inside washing tub 3 about a horizontal rotation axis A.
  • suspension system 4 in the example shown it consists of a number of coil springs 6 (only one shown in Figure 1 ) connecting the washing tub 3 to the upper portion of casing 2, combined with one or more dampers 7.
  • washing machine 1 also comprises an electric motor 8 which is mechanically connected to drum 5 so as to rotate, on command, drum 5 about its longitudinal rotation axis A inside washing tub 3.
  • Washing tub 3, revolving drum 5, and the other washing machine component parts suspended from casing 2 via suspension system 4 form the washing assembly of the washing machine.
  • household appliance 1, i.e. washing machine 1 also comprises a vibration damper 9 which is fixed to casing 2 to reduce vibrations transmitted to casing 2 by suspension system 4 as revolving drum 5 rotates.
  • vibration damper 9 is fixed inside casing 2 and comprises a supporting bar 10 rigidly fixed to casing 2 and extending parallel to a horizontal reference axis B which is preferably, though not necessarily, perpendicular to rotation axis A of drum 5; a first permanent-, or electro- magnet 11 which generates a constant magnetic field and is rigidly fitted to supporting bar 10 with its magnetic poles aligned with reference axis B; and a second electromagnet 12 fitted in sliding manner to supporting bar 10 so as that one of its two magnetic.poles is directly faced to one of the magnetic poles of magnet 11, thus allowing the magnetic field of electromagnet 12 to interact with the magnetic field of magnet 11.
  • vibration damper 9 also comprises an electric power unit 13 which is capable to power the induction coil of electromagnet 12 with a variable-frequency alternate current, so that electromagnet 12 generates a variable magnetic field which, interacting with the magnetic field generated by magnet 11, causes a reciprocating movement of electromagnet 12 along supporting bar 10.
  • Electric power unit 13 which is capable to power the induction coil of electromagnet 12 with a variable-frequency alternate current, so that electromagnet 12 generates a variable magnetic field which, interacting with the magnetic field generated by magnet 11, causes a reciprocating movement of electromagnet 12 along supporting bar 10.
  • Magnetic poles having the same magnetic polarity in fact, tend to push away one from the other, whereas magnetic poles having opposite magnetic polarity tend to attract one to the other.
  • vibration damper 9 finally comprises an accelerometer 14 or similar sensor capable of determine, instant by instant, the amplitude and frequency spectrum of casing 2 vibrations; and an electronic central control unit 15 which receives the signals from sensor 14 and is capable to determine, instant by instant, the appropriate frequency of the alternate current to be supplied to electromagnet 12 for producing mechanical vibrations in phase-opposition with respect to the mechanical vibrations transmitted to casing 2 via suspension system 4, so as to reduce casing 2 vibrations amplitude in the whole range of the possible rotation speeds of revolving drum 5.
  • an accelerometer 14 or similar sensor capable of determine, instant by instant, the amplitude and frequency spectrum of casing 2 vibrations
  • an electronic central control unit 15 which receives the signals from sensor 14 and is capable to determine, instant by instant, the appropriate frequency of the alternate current to be supplied to electromagnet 12 for producing mechanical vibrations in phase-opposition with respect to the mechanical vibrations transmitted to casing 2 via suspension system 4, so as to reduce casing 2 vibrations amplitude in the whole range of the possible rotation speeds of revolving drum 5.
  • electronic central control unit 15 of vibration damper 9 controls electric power unit 13 for tuning up, instant by instant, the maximum value and frequency of the alternate current supplied to electromagnet 12 according to the actual amplitude and frequency spectrum of casing 2 vibration, for performing a selective damping of casing 2 vibrations while revolving drum 5 is rotating at any speed causing dangerous resonance phenomena and/or causing excessive noise.
  • magnet 11 consists of cylindrical-shaped permanent magnet extending coaxial to reference axis B of supporting bar 10, and having its magnetic north pole directly faced to electromagnet 12, whereas electromagnet 12 consists of an upside down L-shaped metallic body 16 having preferably, though not necessarily, ferromagnetic characteristics, and which has its horizontal upper portion 16a fitted in sliding manner to supporting bar 10; and of an induction coil 17 of electrically conducting material, which is rigidly fitted to the vertical lower portion 16b of metallic body 16 so as to generate, when supplied with electric current, a magnetic field which creates on metallic body 16 a magnetic north pole and a magnetic south poles.
  • Electric power unit 13 of vibration damper 9 powers induction coil 17 of electromagnet 12 with a variable-frequency alternate current, so that the magnetic north and south poles on metallic body 16 shift their position in synchrony with the alternate current.
  • vibration damper 9 is able to reduce vibrations amplitude over the whole range of the possible rotation speeds of revolving drum 5. Moreover, being able to tune up the mechanical vibrations of electromagnet 12 with respect to any possible resonant frequency of the washing machine structure, vibration damper 9 eliminates all resonance phenomena.
  • vibration damper 9 has therefore numerous advantages: stability and silenceness of the landry washing machine 1 is strongly increased at any possible rotation speed of revolving drum 5.
  • Frahm dampers i.e. comprising a small oscillating mass and a number of coil springs
  • operativeness of vibration damper 9 extends to all possible frequencies of casing 2 vibrations.
  • vibration damper 9 as described herein without, however, departing from the scope of the present invention.
  • vibration damper 9 may comprise a further electromagnet 18 which is fitted in sliding manner to supporting bar 10, on the opposite side of electromagnet 12 with respect to magnet 11, so as to be faced to the second magnetic pole of magnet 11.
  • electromagnets 12 and 18 are located on opposite sides of magnet 11.
  • electromagnet 18 has one of its two magnetic poles directly faced to one of the magnetic poles of magnet 11 for allowing its magnetic field to interact with the magnetic field of magnet 11; and electric power unit 13 powers the induction coil of electromagnet 18 with a variable-frequency alternate current so that also electromagnet 18 generates a variable magnetic field which, interacting with the magnetic field generated by magnet 11, causes a reciprocating movement of electromagnet 18 along supporting bar 10.
  • electronic central control unit 15 of vibration damper 9 may control electric power unit 13 for tuning up, instant by instant, the alternate current supplied to electromagnet 12 and the alternate current supplied to electromagnet 18 independently one from the other.
  • vibration damper 9 If the alternate current supplied to electromagnet 12 differs from the alternate current supplied to electromagnet 18, vibration damper 9 generates two mechanical vibrations having two different frequencies, thus allowing a much more accurate dumping of the vibrations transmitted to casing 2 via suspension system 4.
  • vibration damper 9 may comprise two supporting bars 10 and 10' which are rigidly fixed to casing 2 one parallel to the other, and each of which extends parallel to a respective horizontal reference axis B, B' which is preferably, though not necessarily, perpendicular to rotation axis A of drum 5; two permanent-, or electro- magnets 11 and 11', each of which generates a constant magnetic field and is rigidly fitted to a respective supporting bar 10 or 10' with its two magnetic poles aligned with reference axis B, B' of the bar; and two electromagnets 12 and 12' fitted in sliding manner to supporting bars 10 and 10' on opposite sides of both magnets 11 and 11', so as that each electromagnet 12, 12' has its two magnetic poles directly faced each to a respective magnetic pole of a different magnet 11, 11', thus allowing the magnetic field of both electromagnets 12 and 12' to interact with the magnetic field of both magnets 11 and 11'.
  • supporting bars 10 and 10' lie, one above the other, on a common vertical plane which is perpendicular to rotation axis A of drum 5, whereas the two permanent-, or electromagnets 11 and 11' are rigidly fixed to supporting bars 10 and 10' vertically aligned one above the other with a specular orientation of the magnetic poles.
  • each of them consists of a preferably, though not necessarily, ferromagnetic C-shaped metallic body 19 having each of its two end-portions 19a fitted in sliding manner to a respective supporting bar 10, 10', so as to be directly faced to a corresponding permanent-, or electro- magnet 11 or 11'; and of an induction coil 20 of electrically conducting material, which is rigidly fitted to the central portion 19b of metallic body 16 so as to generate, when supplied with electric current, a magnetic field which creates on metallic body 16 a magnetic north pole and a magnetic south pole.
  • electric power unit 13 powers the induction coil 20 of each electromagnet 12, 12' with a specific variable-frequency alternate current, so that each electromagnet 12, 12' generates a corresponding variable magnetic field which, interacting with the magnetic fields generated by both magnets 11 and 11', causes a reciprocating movement of the electromagnet 12, 12' along both supporting bars 10 and 10'; whereas electronic central control unit 15 controls electric power unit 13 for tuning up, instant by instant, the alternate current supplied to each of the two electromagnets 12 and 12'.
  • the two electromagnets 12 and 12' move in synchrony along supporting bars 10 and 10', doubling the seismic mass and, thus, the amplitude of the mechanical vibrations generated by vibration damper.
  • the two electromagnets 12 and 12' reciprocate along supporting bars 10 and 10' at different frequencies, thus allowing vibration damper 9 to generate two different mechanical vibrations.
  • electromagnet/s 12, 12' and 18 may be rigidly fixed to supporting bar/s 10, 10', while permanent-, or electro- magnet/s 11 and 11' may be fitted in sliding manner to supporting bar/s 10 and 10'.

Claims (10)

  1. Haushaltsgerät (1), umfassend ein Gehäuse (2), das Schwingungen unterworfen ist, und einen an dem Gehäuse (2) befestigten Schwingungsdämpfer (9), um die Schwingungen des Gehäuses zu reduzieren, wobei das Haushaltsgerät (1) dadurch gekennzeichnet ist, dass der Schwingungsdämpfer (9) umfasst:
    - einen Tragrahmen (10), der starr an dem Gehäuse (2) des Geräts befestigt ist;
    - mindestens einen ersten Magneten (11, 11'; 12, 18, 12'), der starr an dem Tragrahmen (10) angebracht ist, und
    - mindestens einen zweiten Magneten (12, 18, 12'; 11, 11'), der schiebbar an dem Tragrahmen (10) angebracht ist, derart, dass einer seiner Magnetpole einem der Magnetpole des ersten Magneten (11) gegenüberliegt, um es dem Magnetfeld des zweiten Magneten (12, 18, 12'; 11, 11') zu ermöglichen, mit dem Magnetfeld des ersten Magneten (11, 11'; 12, 18, 12') zu interagieren;
    wobei der erste Magnet (11, 11'; 12, 18, 12') oder der zweite Magnet (12, 18, 12'; 11, 11') ein Elektromagnet (12, 12', 18) ist, und wobei der Schwingungsdämpfer (9) auch Folgendes umfasst:
    - Stromversorgungsmittel (13), die geeignet sind, die Induktionsspule (17, 20) des Elektromagneten (12, 12', 18) mit einem Wechselstrom zu versorgen, um eine hin- und hergehende Bewegung des zweiten Magneten (12, 18, 12'; 11, 11') entlang dem Tragrahmen (10) hervorzurufen, und
    - eine zentrale Steuereinheit (15), die die Stromversorgungsmittel (13) steuert und geeignet ist, von Augenblick zu Augenblick die Frequenz des Wechselstroms zu bestimmen, der der Induktionsspule (17, 20) des Elektromagneten (12, 12', 18) zuzuführen ist, um mechanische Schwingungen zu erzeugen, die in Bezug auf die mechanischen Schwingungen des Gehäuses (2) des Geräts annähernd gegenphasig sind.
  2. Haushaltsgerät nach Anspruch 1, dadurch gekennzeichnet, dass es auch Erkennungsmittel (14) umfasst, die geeignet sind, von Augenblick zu Augenblick das Amplituden- und Frequenzspektrum der mechanischen Schwingungen des Gehäuses (2) des Geräts zu bestimmen; wobei die zentrale Steuereinheit (15) mit den Erkennungsmitteln (14) verbunden ist und geeignet ist, auf der Basis des Amplituden- und Frequenzspektrums der mechanischen Schwingungen die Frequenz des Wechselstroms zu bestimmen, der der Induktionsspule (17, 20) des Elektromagneten (12, 12', 18) zuzuführen ist.
  3. Haushaltsgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste Magnet (11, 11'; 12, 18, 12') oder der zweite Magnet (12, 18, 12'; 11, 11'), der kein Elektromagnet (12, 12', 18) ist, ein Permanentmagnet (11, 11') ist.
  4. Haushaltsgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zweite Magnet (12, 18, 12'; 11, 11') geeignet ist, an dem Tragrahmen (10) entlang einer im Wesentlichen horizontalen Bezugsachse (B) eine hin- und hergehende Bewegung auszuführen.
  5. Haushaltsgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schwingungsdämpfer (9) ein Paar zweiter Magneten (12, 18, 12'; 11, 11') umfasst, die an Seiten, die dem ersten Magneten (11, 11'; 12, 18, 12') entgegengesetzt sind, schiebbar an dem Tragrahmen (10) angebracht sind.
  6. Haushaltsgerät nach Anspruch 5, dadurch gekennzeichnet, dass der Schwingungsdämpfer (9) ein Paar erster Magneten (11, 11'; 12, 18, 12') umfasst, die zwischen den zweiten Magneten (12, 18, 12'; 11, 11') angeordnet sind; wobei jeder der ersten Magneten (11, 11'; 12, 18, 12') einem der zwei Magnetpole jedes zweiten Magneten (12, 18, 12'; 11, 11') gegenüberliegt.
  7. Haushaltsgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Schwingungsdämpfer (9) ein Paar erster Magneten (11, 11'; 12, 18, 12') umfasst, die am Tragrahmen (10) an Seiten befestigt sind, die dem zweiten Magneten (12, 18, 12'; 11, 11') entgegengesetzt sind.
  8. Haushaltsgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schwingungsdämpfer (9) innerhalb des Gehäuses (2) befestigt ist.
  9. Haushaltsgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es eine Wäschewaschmaschine (1) ist.
  10. Haushaltsgerät nach den Ansprüchen 9 und 4, dadurch gekennzeichnet, dass die Waschmaschine (1) eine sich drehende Trommel (5) umfasst, die die zu waschende Wäsche aufnimmt und in dem Gehäuse (2) drehbar um eine gegebene Drehachse (A) montiert ist; wobei die Bezugsachse (B), an der sich der zweite Magnet (12, 18, 12'; 11, 11') hin- und herbewegt, im Wesentlichen senkrecht zu der Drehachse (A) ist.
EP07121046A 2007-11-19 2007-11-19 Haushaltsgerät Not-in-force EP2060667B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES07121046T ES2349442T3 (es) 2007-11-19 2007-11-19 Electrodoméstico.
DE602007007963T DE602007007963D1 (de) 2007-11-19 2007-11-19 Haushaltsgerät
EP07121046A EP2060667B1 (de) 2007-11-19 2007-11-19 Haushaltsgerät
AT07121046T ATE474953T1 (de) 2007-11-19 2007-11-19 Haushaltsgerät
PL07121046T PL2060667T3 (pl) 2007-11-19 2007-11-19 Urządzenie stosowane w gospodarstwie domowym
RU2008145562/12A RU2467106C2 (ru) 2007-11-19 2008-11-18 Бытовое устройство

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07121046A EP2060667B1 (de) 2007-11-19 2007-11-19 Haushaltsgerät

Publications (2)

Publication Number Publication Date
EP2060667A1 EP2060667A1 (de) 2009-05-20
EP2060667B1 true EP2060667B1 (de) 2010-07-21

Family

ID=39262590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121046A Not-in-force EP2060667B1 (de) 2007-11-19 2007-11-19 Haushaltsgerät

Country Status (6)

Country Link
EP (1) EP2060667B1 (de)
AT (1) ATE474953T1 (de)
DE (1) DE602007007963D1 (de)
ES (1) ES2349442T3 (de)
PL (1) PL2060667T3 (de)
RU (1) RU2467106C2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107131241A (zh) * 2017-06-29 2017-09-05 上海洁神洗涤机械制造有限公司 一种洗脱机的悬浮减震系统
TR201721912A2 (tr) * 2017-12-26 2019-07-22 Arcelik As Döner tambur i̇çi̇n enerji̇ kaynaği

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6087951A (en) * 1999-04-05 2000-07-11 The Cherry Corporation Magnetic accelerometer
JP4931305B2 (ja) * 2000-10-30 2012-05-16 株式会社デルタツーリング マグネットユニット
KR100565659B1 (ko) 2004-02-23 2006-03-30 엘지전자 주식회사 세탁기의 댐퍼 및 그 제어방법
WO2005085194A2 (en) 2004-03-08 2005-09-15 Prosidion Limited Indole-2-carboxylic acid hydrazides as glycogen phosphorylase inhibitors
JP4412723B2 (ja) * 2004-09-13 2010-02-10 パナソニック株式会社 ドラム式洗濯機

Also Published As

Publication number Publication date
ATE474953T1 (de) 2010-08-15
RU2467106C2 (ru) 2012-11-20
EP2060667A1 (de) 2009-05-20
ES2349442T3 (es) 2011-01-03
DE602007007963D1 (de) 2010-09-02
PL2060667T3 (pl) 2011-01-31
RU2008145562A (ru) 2010-05-27

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